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- Switching Power Supply has three kinds of control circuits: Pulse Width Modulation (PWM), Pulse Frequency Modulation (PFM), Pulse Width and Frequency Modulation (PWM-PFM). 开关电源有三种控制方式：脉冲宽度调制(PWM)、脉冲频率调制(PFM)、脉冲宽度频率调制(PWM-PFM)。
- A new kind of time series, which is used as the ‘HRV Signals’ for the purpose of nonlinear dynamics analysis of HRV, is introduced based on the Integral Pulse Frequency Modulation (IPFM) model. 该时间序列对 于影响HRV的内在系统是一个更为直接的观察量，不但可以应用于非线性动 力学研究，还可以用于其它的一些分析方法。通过RR间期序列的功率谱与HRV 时间序列功率谱的对比，表明后者的功率谱具有较少的波峰数目和相对弱的宽 带特性，说明某些病例中RR间期的功率谱中的宽带特性是由于非线性观察函 数引起的，而不一定是系统内在混饨特性的反映。
- pulse frequency modulation control system 脉冲调频控制系统
- Pulse Frequency Modulation Theory and Realize 调频光端机原理及实现
- pulse frequency modulation telemetry 脉冲调频遥测术
- integrated circuit pulse frequency modulator 集成电路脉冲频率调制器
- integral pulse frequency modulation 积分脉冲调频
- SSIPFM Single-signal Integral Pulse Frequency Modulation 单信号积分脉冲频率调制
- An Analysis of the Detective Performance of the Pulse Frequency Modulation Wave 脉冲调频波探测性能分析
- An Optoelectronic Pulse Frequency Modulation Circuit for Retinal Prosthesis 用于视网膜修复的光电脉冲频率调制电路
- Pulse frequency modulation magnetic tape record type strong-motion instrument 脉衝调频式磁带记录强震仪
- pulsed frequency modulated carrier 脉冲调频载波
- Application of Pulse Frequence Modulation in Flyback Converter 脉冲频率调制在反激式变换器中的应用
- Design and Improvement of Pulse Frequency Modulation Optical Fiber Video and Audio Transmission System 脉冲频率调制光纤传输系统原理及改进
- Frequency modulation does not allow static to creep in. 频率调制不允许静电干扰混入。
- Hardware pulse distribution, and can be controlled stepper pulse frequency to the governor. 硬件脉冲分配方式，可以控制步进脉冲的频率来调速。
- Increase in intensity,retention time and the pulse frequency could enhance the efficiency. 增加磁场强度、处理时间和脉冲频率可以提高杀菌效果.
- Frequency modulation is not possible with polychromatic light. 多色光不可能调制频率。
- Describes a new design of pulse frequency dividers in which timers NE556 and sequencecontrol unijunction transistors are used. 利用定时器NE556和程控单结晶体管，设计了一种新型多路脉冲分配器。
- The Linear Frequency Modulated（LFM） signal is a popular pulse compression radar signal. 摘要 线性调频信号是雷达中常采用的一种脉冲压缩信号。
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- 深远海浮式风电平台 - deep-sea floating wind power platform
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- 京雄高速公路 - Beijing-Xiongan expressway
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- 农业及相关产业增加值 - the added value of agriculture and related industries
